California was the first state to adopt the “no-fault divorce” concept. This means that the grounds for California divorce  are simply “irreconcilable differences.” In effect, this simply means that a married person who wants to end the marriage can do so, even if the other spouse wants to stay together. In the past, most states only granted divorces on fault grounds, but today all states have adopted a form of no fault divorce. In a no fault divorce,  neither party is held responsible for the failure of the marriage. This means that the grounds for California divorce are not based on adultery, cruelty, abandonment, mental illness, or criminal conviction, and such allegations will not prove or impose any extra advantage in the outcome of the divorce proceedings to the aggrieved spouse.